マグロ延繩の揚繩速度について-予-〔英文〕

概要

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Significance of clarifying the variability in hauling speed of tuna longline lies on such fact that the hauling speed may govern the daily capacity of a boat for fishing. The records collected from the hauling work by a training tuna longliner showed the following tendencies: 1. About 64% of the baskets (225m long) could be hauled up in one minute, 34% in two minutes, and the rest 2.% in three to six minutes. 2. A catch of high-priced fish or ferocious one retarded the hauling speed. 3. The hauling speed showed a three basket periodicity. But whether this is valid due to that in tautness of mainline or nothing but a false one due to treatment of fractional time in measuring the speed is doubtful. 4. The difference in skipper and in wind from 2 to 9m/sec. caused no difference in hauling speed, so far as the present study had concerned.
社団法人日本水産学会の論文